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Exam Cybersecurity Fundamentals Specialist All Questions

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Exam Cybersecurity Fundamentals Specialist topic 1 question 48 discussion

Actual exam question from ISA's Cybersecurity Fundamentals Specialist
Question #: 48
Topic #: 1
[All Cybersecurity Fundamentals Specialist Questions]

Which is a physical layer standard for serial communications between two or more devices?

  • A. RS232
  • B. RS235
  • C. RS432
  • D. RS485
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Suggested Answer: D 🗳️

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ac873d6
8 months ago
Selected Answer: D
RS-485 became the standard physical layer for automation protocols such as Modbus RTU and PROFIBUS. This is because it supports longer runs, higher speeds, and multiple devices. Source: https://automationcommunity.com/rs232-rs422-rs485/#rs-485 RS232 is only between two devices.
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